Messages in this thread | | | Date | Wed, 18 Mar 2020 12:53:58 +0100 | From | Greg KH <> | Subject | Re: [PATCH v3 24/24] firmware: xilinx: Add sysfs and API to set boot health status |
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On Fri, Mar 06, 2020 at 03:47:32PM -0800, Jolly Shah wrote: > From: Rajan Vaja <rajan.vaja@xilinx.com> > > Add sysfs interface to set boot health status from user space. > Add API used by this interface to communicate with firmware. > > If PMUFW is compiled with CHECK_HEALTHY_BOOT, it will check the > healthy bit on FPD WDT expiration. If healthy bit is set by a user > application running in Linux, PMUFW will do APU only restart. If > healthy bit is not set during FPD WDT expiration, PMUFW will do > system restart. > > Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com> > Signed-off-by: Michal Simek <michal.simek@xilinx.com> > Signed-off-by: Jolly Shah <jollys@xilinx.com> > Signed-off-by: Tejas Patel <tejas.patel@xilinx.com> > Signed-off-by: Jolly Shah <jolly.shah@xilinx.com> > --- > .../ABI/stable/sysfs-driver-firmware-zynqmp | 21 ++++++++ > drivers/firmware/xilinx/zynqmp.c | 63 ++++++++++++++++++++++ > include/linux/firmware/xlnx-zynqmp.h | 3 ++ > 3 files changed, 87 insertions(+) > > diff --git a/Documentation/ABI/stable/sysfs-driver-firmware-zynqmp b/Documentation/ABI/stable/sysfs-driver-firmware-zynqmp > index b46ec0c..a37b408 100644 > --- a/Documentation/ABI/stable/sysfs-driver-firmware-zynqmp > +++ b/Documentation/ABI/stable/sysfs-driver-firmware-zynqmp > @@ -80,3 +80,24 @@ Description: > # echo "subsystem" > /sys/devices/platform/firmware\:zynqmp-firmware/shutdown_scope > > Users: Xilinx > + > +What: /sys/devices/platform/firmware\:zynqmp-firmware/health_status > +Date: March 2020 > +KernelVersion: 5.6 > +Contact: "Jolly Shah" <jollys@xilinx.com> > +Description: > + This sysfs interface allows to set the health status. If PMUFW > + is compiled with CHECK_HEALTHY_BOOT, it will check the healthy > + bit on FPD WDT expiration. If healthy bit is set by a user > + application running in Linux, PMUFW will do APU only restart. If > + healthy bit is not set during FPD WDT expiration, PMUFW will do > + system restart. > + > + Usage: > + Set healthy bit > + # echo 1 > /sys/devices/platform/firmware\:zynqmp-firmware/health_status > + > + Unset healthy bit > + # echo 0 > /sys/devices/platform/firmware\:zynqmp-firmware/health_status > + > +Users: Xilinx > diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c > index 9caf1cf..fc3aa4e 100644 > --- a/drivers/firmware/xilinx/zynqmp.c > +++ b/drivers/firmware/xilinx/zynqmp.c > @@ -667,6 +667,21 @@ int zynqmp_pm_read_pggs(u32 index, u32 *value) > EXPORT_SYMBOL_GPL(zynqmp_pm_read_pggs); > > /** > + * zynqmp_pm_set_boot_health_status() - PM API for setting healthy boot status > + * @value Status value to be written > + * > + * This function sets healthy bit value to indicate boot health status > + * to firmware. > + * > + * @return Returns status, either success or error+reason > + */ > +int zynqmp_pm_set_boot_health_status(u32 value) > +{ > + return zynqmp_pm_invoke_fn(PM_IOCTL, 0, IOCTL_SET_BOOT_HEALTH_STATUS, > + value, 0, NULL); > +} > + > +/** > * zynqmp_pm_reset_assert - Request setting of reset (1 - assert, 0 - release) > * @reset: Reset to be configured > * @assert_flag: Flag stating should reset be asserted (1) or > @@ -995,6 +1010,53 @@ static const struct attribute_group shutdown_scope_attribute_group = { > }; > > /** > + * health_status_store - Store health_status sysfs attribute > + * @device: Device structure > + * @attr: Device attribute structure > + * @buf: User entered health_status attribute string > + * @count: Buffer size > + * > + * User-space interface for setting the boot health status. > + * Usage: echo <value> > /sys/devices/platform/firmware\:zynqmp-firmware/health_status > + * > + * Value: > + * 1 - Set healthy bit to 1 > + * 0 - Unset healthy bit > + * > + * Return: count argument if request succeeds, the corresponding error > + * code otherwise > + */ > +static ssize_t health_status_store(struct device *device, > + struct device_attribute *attr, > + const char *buf, size_t count) > +{ > + int ret; > + unsigned int value; > + > + ret = kstrtouint(buf, 10, &value); > + if (ret) > + return ret; > + > + ret = zynqmp_pm_set_boot_health_status(value); > + if (ret) { > + pr_err("unable to set healthy bit value to %u\n", value);
You have a valid struct device right there, use it!
dev_err() please...
thanks,
greg k-h
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